Ignore 'none' keyword for box-shadows and z-indexes (#98)

* ignore keywords for box-shadows

* ignore keywords for z-indexes

closes #97

Author: bartveneman

src/analyzer/values/box-shadows.js

@@ -1,8 +1,10 @@
 const uniquer = require('../../utils/uniquer')
+const {KEYWORDS} = require('../../utils/css')
 
 module.exports = declarations => {
   const all = declarations
     .filter(({property}) => property === 'box-shadow')
+    .filter(({value}) => !KEYWORDS.includes(value))
     .map(declaration => declaration.value)
 
   const {unique, totalUnique} = uniquer(all)

test/analyzer/values/box-shadows.js

@@ -80,3 +80,31 @@ test('It recognizes an advanced box-shadow with multiple shadows', t => {
 
   t.deepEqual(actual, expected)
 })
+
+test('It ignores CSS keywords', t => {
+  const expected = {
+    total: 0,
+    totalUnique: 0,
+    unique: []
+  }
+  const actual = analyze([
+    {
+      property: 'box-shadow',
+      value: 'none'
+    },
+    {
+      property: 'box-shadow',
+      value: 'inherit'
+    },
+    {
+      property: 'box-shadow',
+      value: 'initial'
+    },
+    {
+      property: 'box-shadow',
+      value: 'unset'
+    }
+  ])
+
+  t.deepEqual(actual, expected)
+})

test/analyzer/values/z-indexes.js

@@ -47,6 +47,14 @@ test('It ignores keywords, and global values', t => {
     {
       property: 'z-index',
       value: 'unset'
+    },
+    {
+      property: 'z-index',
+      value: 'initial'
+    },
+    {
+      property: 'z-index',
+      value: 'inherit'
     }
   ])